Hotfix links required by CRAN

Fom CRAN mail when submitting the package:

Found the following (possibly) invalid URLs:
URL: https://cran.r-project.org/web/packages/CSIndicators/index.html
From: README.md
Status: 200
Message: OK
CRAN URL not in canonical form
URL: https://cran.r-project.org/web/packages/s2dv/index.html
From: README.md
Status: 200
Message: OK
CRAN URL not in canonical form
URL: https://cran.r-project.org/web/packages/startR/index.html
From: README.md
Status: 200
Message: OK
CRAN URL not in canonical form
The canonical URL of the CRAN page for a package is
https://CRAN.R-project.org/package=pkgname

URL: https://www.gdal.org (moved to https://gdal.org/)  
  From: man/CST_RFWeights.Rd  
  Status: 301  
  Message: Moved Permanently  

Please change http --> https, add trailing slashes, or follow moved content as appropriate.